Beginning Ajax With ASP.NET (2006).pdf

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Control Extenders With ASP.NET, there is a set of controls that developers have become fairly familiar with. These controls include things like the textbox, label, drop-down list box, and many others. One of the questions that Atlas brings to the table is how to provide additional functionality to these controls, while maintaining the programming model that developers have come to be familiar with. Into this problem step control extenders. With control extenders, client-side functionality is added to an existing server-side control, while maintaining the server-side programming model. There are numerous examples of these extensions of existing controls. You are going to see the AutoComplete extender control in the next section. The AutoComplete extender control is designed to extend the capabilities of an ASP.NET Textbox control. The AutoComplete control will extend the functionality of the Textbox control by hooking it to a web service to get information. In Chapter 12, the Drag and Drop extender will be presented. It will provide Drag and Drop support through Atlas. AutoComplete One of the classic examples of Ajax has been a textbox that is similar in concept to the Windows combo box (similar, but not quite the same). This feature has been popularized by the Google Suggest service. Atlas provides the capability to extend the in ASP.NET 2.0. This extension takes input from the textbox, passes the text to the web service, and the web service returns a list of possible items, similar to the Windows Combo Box. Take a look at the following simple example. Here is the ASPX code. Look at what is being specified. Atlas Controls ❑ ❑ ❑ There is an ASP.NET textbox. This is the standard textbox in ASP.NET. There is a new type of server control. This is an extender control, and specifically the AutoCompleteExtender. It is a server control that acts on the ASP.NET textbox. The extender control “extends” the functionality in the textbox. There are series of properties specified within the tag: ❑ ❑ ❑ TargetControlID — The TargetControlID is the control that will be the target of the extender. ServicePath — The ServicePath property is the path to the web service that will be called. ServiceMethod — The ServiceMethod property is the name of the function within the web service. 293
Chapter 11 Now that you have seen the ASPX code, look at the web service: [WebMethod] public String[] TextBoxAutoComplete(string prefixText, int count) // Seems to be a problem if the names are not prefixText and count { int i = 0; int iLength = 10; List Values = new List(); } for (i = 0; (i < iLength); i++ ) { Values.Add(Convert.ToString(prefixText + i.ToString())); } String[] strReturn = new String[Values.Count]; strReturn = Values.ToArray(); return (strReturn); The issues with the web service are: ❑ ❑ ❑ A set of strings in the form of an array must be returned. The input parameters must be a string and an integer. In addition, at the time of this writing, these parameters must be named prefixText and count. Naming these values something different will result in the code not working correctly. In this example, the code is designed to take an input and add the values 0–9. This code merely takes the input and adds a number. It expects a number to be input, but there is no specific checking in the example. Now that you have seen the code, look at the output of the AutoCompleteExtender in Figure 11-3. Figure 11-3 294
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Beginning Ajax with ASP.NET Wallace
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Beginning Ajax with ASP.NET Wallace
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Executive Editor Bob Elliott Senior
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About the Authors Wallace B. “Wal
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Acknowledgments It is truly interes
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Contents Manipulating the Style She
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Contents Chapter 7: Ajax.NET Profes
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Contents Chapter 11: Atlas Controls
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Introduction Thank you for purchasi
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Tips, hints, tricks, and asides to
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1 Introduction to Ajax on ASP.NET O
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Introduction to Ajax on ASP.NET Mic
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Introduction to Ajax on ASP.NET ❑
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Introduction to Ajax on ASP.NET ❑
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Who’s Using Ajax? Introduction to
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2 Introduction to DHTML Dynamic HTM
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Writing Your First Block of JavaScr
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Introduction to DHTML document.writ
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Introduction to DHTML Figure 2-3 Ex
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Introduction to DHTML The return ke
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Introduction to DHTML var isArrowLe
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Using the innerHTML Property Introd
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To illustrate this behavior, the ne
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Introduction to DHTML Now that you
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Chapter 3 From Static to Dynamic
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Chapter 3 Within the section of th
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Chapter 3 Just a reminder of what w
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Chapter 3 /* */ Datatypes These are
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Chapter 3 Composite types are requi
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Chapter 3 These sets of operators a
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Chapter 3 var y = 0; do { y = y + 1
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Chapter 3 Figure 3-1 shows the resu
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Chapter 3 This allows you to assign
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Chapter 3 Because the constructor i
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Chapter 3 This produces the result
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Chapter 3 window navigator location
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Chapter 3 There are four levels of
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Chapter 3 var featuresLevel1 = [“
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Chapter 3 Take a look at a simple e
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Chapter 3 For this particular examp
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Chapter 3 The method getElementById
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Chapter 3 Cloning a Node This
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Chapter 3 Node Type Type Descriptio
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Chapter 3 Figure 3-7 Figure 3-8 68
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Chapter 3 The DOM, Styles, and CSS
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Chapter 3 Try It Out Modifying a St
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Chapter 3 which includes a script f
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4 The XMLHttpRequest Object The XML
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The XMLHttpRequest Object above, Op
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The XMLHttpRequest Object while the
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The XMLHttpRequest Object The secon
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Using the responseText Property The
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The XMLHttpRequest Object As you ca
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Next listed in the following code b
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The XMLHttpRequest Object } // Exec
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The XMLHttpRequest Object Property
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The XMLHttpRequest Object - Select
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The XMLHttpRequest Object In additi
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The XMLHttpRequest Object xmlHttpOb
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The XMLHttpRequest Object at System
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5 Data Communication: XML, XSLT, an
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1986 by ISO standard “ISO 8879:19
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Consider the following code sample
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Data Communication: XML, XSLT, and
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X Path Data Communication: XML, XSL
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6 What Is Built into ASP.NET ASP.NE
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What Is Built into ASP.NET
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What Is Built into ASP.NET
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What Is Built into ASP.NET ❑ ❑
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method. This method allows a develo
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What Is Built into ASP.NET Client/B
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What Is Built into ASP.NET Client/B
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What Is Built into ASP.NET // Get o
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What Is Built into ASP.NET using Sy
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What Is Built into ASP.NET Value S
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DataSet object with some data and s
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Dealing with the Returned Data on t
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What Is Built into ASP.NET // Add t
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What Is Built into ASP.NET } names.
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What Is Built into ASP.NET ❑ Para
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explicit server-side coding is requ
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Chapter 7 Acquiring Ajax.NET Pro Ve
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Chapter 7 The server-side code that
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Chapter 7 So, your entire server-si
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Chapter 7 What Is a Language Proxy?
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Chapter 7 Using strings will get yo
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Chapter 7 the name and street prope
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Chapter 7 Chapter7_ImageSwitcherCal
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Chapter 7 Checking for Null Values
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Chapter 7 The fourth script source
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8 Anatomy of Ajax.NET Pro Library T
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Anatomy of Ajax.NET Pro Library Fig
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Anatomy of Ajax.NET Pro Library Mas
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Line 25 creates the actual JavaScri
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Anatomy of Ajax.NET Pro Library 09.
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Anatomy of Ajax.NET Pro Library 19.
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Anatomy of Ajax.NET Pro Library 105
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What Is an Ajax.NET Pro Converter?
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9 Other Ajax Frameworks for .NET Aj
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Testing for Features Using the Sari
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Attaching an event to check for the
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The framework contains supporting c
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Other Ajax Frameworks for .NET lock
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Panels versus Custom Controls Once
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Other Ajax Frameworks for .NET cust
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Creating the Solution 1. Open Visua
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Other Ajax Frameworks for .NET Not
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Other Ajax Frameworks for .NET Swit
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Other Ajax Frameworks for .NET Figu
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Other Ajax Frameworks for .NET Imag
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Other Ajax Frameworks for .NET } }
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Other Ajax Frameworks for .NET feat
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Other Ajax Frameworks for .NET bord
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txtTitle_TextChanged event and will
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Other Ajax Frameworks for .NET Fina
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Other Ajax Frameworks for .NET
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Other Ajax Frameworks for .NET Fina
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Other Ajax Frameworks for .NET cont
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Other Ajax Frameworks for .NET The
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Debugging Debugger Keyword Test Pa
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Debugging Figure 13-16 Try It Out U
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Debugging The Command window will h
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Debugging Although this section of
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install the Venkman tool within Fir
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Debugging true); xmlHttpObj.open(
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Debugging TestFiddler.aspx.cs — C
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Debugging Figure 13-25 This is usef
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Debugging using System.Collections;
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Debugging Replace the text button%2
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A XSLT Commands This appendix provi
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XSLT Commands Element preserve-spac
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Boolean XSLT Commands The boolean f
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XSLT Commands Name adjust-dateTime-
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XSLT Commands Name Description subs
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Index
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AjaxPro.AjaxMethod() attribute Ajax
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attributes (continued) attributes (
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Command window Command window, 346-
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document-uri(node) function (XSLT)
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frameworks frameworks Ajax.NET Pro
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functions (XSLT) (continued) functi
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JavaScript (continued) JavaScript (
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libraries (continued) libraries (co
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methods (XSLT) (continued) methods
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Microsoft Atlas project (continued)
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port port 80, 103 port numbers in c
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server-side frameworks (continued)
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value-of element (XSLT) value-of el
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XSLT elements (continued) XSLT elem
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